1. <doc.: IEEE 802.15-doc>
<month year>
<doc.: IEEE doc>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [UWB PHY Proposal to TG8]
Date Submitted: [May 6th, 2013 ]
Source: [Billy Verso, Michael Mc Laughlin]
Company: [DecaWave]
Address: [Adelaide Chambers, Peter Street, Dublin 8, Ireland]
Voice:[ ] Fax: [] [billy.verso “at” decawave.com]
Re: [In response to call for technical proposals to TG8]
Abstract: [ ]
Purpose: [PHY proposal for ]
Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P
Verso, Mc Laughlin (DecaWave)
<author>, <company>

2. UWB PHY Recommendation for 802.15.8
This PHY is proposed to cover the following requirements:
To operate in unlicensed UWB bands and support relative positioning
To provide various data rates in support of different applications
To support mobility and to have a low complexity solution
The a UWB PHY has all the necessary characteristics for peer-aware-communications. Our proposal is that should adopt the 4a UWB PHY with little or no modification
There may be some scope for optional extensions to give more flexibility but in general 4a UWB addresses the PAC requirements well
The MAC can use the PHY to provide the PAC functionality of peer discovery, peer relative positioning, and various communications topologies.
Verso, Mc Laughlin (DecaWave)

3. Reasons TG8 should adopt the 4a UWB PHY(1)
Precision Ranging support allows peer relative positioning
Immunity to multipath effects
15 channels cover unlicensed UWB bands from 3 to 10 GHz
Data rates give trade-off between range and high speed data
110 kbps, 850 kbps, 6.81 Mbps and 27 Mbps
Efficient spectral usage
pseudo random burst hopping fills out the spectrum, allowing more power to be transmitted within the regulatory limits
Modulation and coding combination close to ideal
The concatenated codes are low complexity, (e.g. the Viterbi decoder can be implemented in <3k gates), but despite this the performance is less than 2dB shy of the Shannon limit
Verso, Mc Laughlin (DecaWave)

4. Reasons TG8 should adopt the 4a UWB PHY (2)
Perfect channel sounding
The preamble uses an Ipatov sequence which has with Perfect Periodic Autocorrelation. The ideal channel autocorrelation is an impulse or Kronecker delta function. The preamble allows the channel impulse response and the direct path to be extracted allowing the RX time to be determined accurately – this is key to precision range measurements enabling accurate relative positioning of peer devices
Choice of higher/lower complexity implementations
A coherent transceiver can be implemented in small area of silicon
A non-coherent receiver is possible with a simple energy detector
FEC is systematic – so receiver designer can choose to decode or ignore
Systematic Convolutional Code, and, Reed Solomon code
Low time to market as commercial implementations are available
Verso, Mc Laughlin (DecaWave)

5. Conclusion The proposal is to reuse the 4a UWB PHY for TG8
It gives good performance with operational choices for range vs. data rate, and a choices for implementation complexity
It has properties allowing accurate message time-stamping giving the ability for precision peer relative positioning
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Verso, Mc Laughlin (DecaWave)